How to do 301 redirects in CodeIgniter?

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 redirect($uri = '', $method = 'auto', $code = NULL)

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    $uri (string) – URI string
    $method (string) – Redirect method (‘auto’, ‘location’ or ‘refresh’)
    $code (string) – HTTP Response code (usually 302 or 303)

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redirect('/posts/13', 'New location', 301);